An experimental device for gas explosion induced by spontaneous combustion of residual coal in a coal mine goaf

Abstract

The application discloses a kind of coal mine goaf residual coal spontaneous combustion induced gas explosion experimental device, it is related to coal mine safety experimental equipment technical field, its technical scheme includes goaf simulation cavity, goaf simulation cavity bottom is provided with lifting shell, lifting shell upper portion is provided with first motor, first motor output end is provided with lifting assembly and first threaded rod, first threaded rod is threadedly connected with transmission rod, transmission rod is slidably connected between control shell, in the application, goaf simulation cavity rear end is lifted to be tilted by the movement of lifting plate, and the first threaded rod rotation can drive piston to move in the tilting process of goaf simulation cavity, negative pressure is generated in the first gas cavity when piston moves, so as to drive the limit rod inside second gas cavity to move inward, and the limit rod movement can remove the limit of cleaning scraper, so that cleaning scraper is affected by gravity after goaf simulation cavity is tilted and is scraped along the inside of goaf simulation cavity.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety experimental equipment technology, and in particular to an experimental device for inducing gas explosion by spontaneous combustion of residual coal in coal mine goaf. Background Technology

[0002] An experimental device for induced gas explosions from spontaneous combustion of residual coal in coal goaf areas is presented. This device is specifically designed for research on the disaster mechanisms of coal goaf areas. It can accurately simulate the entire process of spontaneous combustion of residual coal in goaf areas, as well as the dynamic evolution of gas explosions induced during the combustion process, providing scientific experimental data support for coal mine disaster prevention and control. The device can precisely control key parameters such as temperature, gas concentration, and oxygen content during the experiment, recreating the complex environment of the goaf area and clearly presenting the correlation mechanism between spontaneous combustion of residual coal and gas explosions. This facilitates researchers in exploring the causes of disasters and key points for prevention and control. The device is stable in operation, has controllable parameters, good experimental repeatability, is convenient to operate, and has high safety. It is suitable for disaster prevention and control research in research institutions, universities, and coal mining enterprises, helping to improve the prevention and control technology of spontaneous combustion of residual coal and gas explosions in coal goaf areas, and enhancing the level of coal mine safety production.

[0003] In practical use, existing experimental devices for spontaneous combustion of coal residue in goaf areas to induce gas explosions often result in the accumulation of residue and coal ash inside the cavity after the explosion. Manual cleaning is difficult and inefficient, and manual operation poses safety hazards due to high temperatures and residual gas. Therefore, a new experimental device for spontaneous combustion of coal residue in goaf areas to induce gas explosions is proposed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing experimental devices for inducing gas explosions by spontaneous combustion of residual coal in coal goaf areas, where residue and coal ash accumulate inside the cavity after the explosion, making manual cleaning difficult and inefficient. Furthermore, manual operation poses safety hazards due to high temperatures and residual gas. Therefore, this invention proposes an experimental device for inducing gas explosions by spontaneous combustion of residual coal in coal goaf areas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf includes a goaf simulation chamber. A lifting shell is located at the bottom of the goaf simulation chamber. A first motor is located on the upper part of the lifting shell. A lifting component and a first threaded rod are located at the output end of the first motor. A transmission rod is threadedly connected to the first threaded rod. The transmission rod is slidably connected to a control shell. A piston is fixedly connected to one side of the transmission rod. The control shell is located on one side of the first motor. A first air chamber is fixedly connected to the end of the control shell away from the first motor. A piston is fixedly connected inside the first air chamber. An air pipe is fixedly connected to one side of the first air chamber. A second air chamber is fixedly connected to the end of the air pipe away from the first air chamber. The second air chamber is fixedly connected to the goaf simulation chamber. A limit rod is slidably connected inside the second air chamber. A cleaning scraper is slidably connected inside the goaf simulation chamber.

[0006] The above technical solution further includes: The lifting assembly includes a first gear disposed at the output end of a first motor, the first gear being meshed with a second gear, and the second gear being rotatably connected to the lifting housing.

[0007] The second gear is fixedly connected to a second threaded rod, the second threaded rod is threadedly connected to a moving block, the moving block is rotatably connected to both sides of a connecting plate, the upper part of the connecting plate is rotatably connected to a lifting plate, and the upper part of the lifting plate is rotatably connected to a goaf simulation cavity.

[0008] The movable block is rotatably connected to two wheels on both sides. The wheels are connected to the lifting housing via a transmission connection. The lifting housing has a moving groove inside, through which the wheels are driven to rotate.

[0009] A gas concentration sensor is installed inside the goaf simulation chamber, and a temperature sensor is installed on one side of the gas concentration sensor. An igniter is fixedly connected inside the goaf simulation chamber, and a heating component is installed on the side wall of the goaf simulation chamber to increase the internal temperature of the goaf simulation chamber.

[0010] The simulated cavity of the goaf is provided with a gas vent. A gas pipe is fixedly connected to one side of the gas vent. A gas cylinder is fixedly connected to the end of the gas pipe away from the gas vent. An air pump is installed at the connection between the gas cylinder and the gas pipe to control the gas input.

[0011] A sealing shell is fixedly connected to the upper part of the goaf simulation cavity. A second motor is installed on the upper part of the sealing shell. A third threaded rod is installed at the output end of the second motor. A lifting block is threadedly connected to the third threaded rod. A sealing plate is fixedly connected to one side of the lifting block. The sealing plate is slidably connected to the goaf simulation cavity.

[0012] The sealed housing is fixedly connected to a slide rail, and a lifting block is slidably connected to the upper part of the slide rail.

[0013] The present invention has the following beneficial effects: 1. In this invention, after the explosion test, starting the first motor can drive the first gear and the first threaded rod to rotate. The rotation of the first gear can drive the second threaded rod to rotate. The rotation of the second threaded rod can drive the lifting plate to move downward. The movement of the lifting plate can cause the rear end of the goaf simulation cavity to rise and tilt. During the tilting process of the goaf simulation cavity, the rotation of the first threaded rod can drive the piston to move. When the piston moves, a negative pressure is generated inside the first air chamber, which drives the limiting rod set inside the second air chamber to move inward. The movement of the limiting rod can release the limitation on the cleaning scraper, so that the cleaning scraper is affected by gravity after the goaf simulation cavity tilts and scrapes along the inside of the goaf simulation cavity, thereby effectively cleaning the residue accumulated inside the goaf simulation cavity after the explosion and reducing the safety hazards of high temperature and residual gas during manual operation.

[0014] 2. In this invention, when the device is in use, gas is introduced into the goaf simulation chamber through the gas vent. The gas concentration is adjusted to the experimental set value by the gas concentration sensor. Then, residual coal is put into the goaf simulation chamber. After the residual coal is put in, the second motor is started, which can drive the sealing plate to move downward, thereby sealing the goaf simulation chamber. Then, the temperature inside the goaf simulation chamber is raised by the heating component, and the igniter is started to induce a gas explosion. Throughout the process, the temperature, gas concentration and explosion-related data are recorded by the sensor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf, as proposed in this invention. Figure 2 This is a schematic diagram of the internal structure of the goaf simulation cavity in this invention; Figure 3 This is a schematic diagram of the internal structure of the second air chamber in this invention; Figure 4 This is a schematic diagram of the internal structure of the first air cavity in this invention; Figure 5 This is a schematic diagram of the connection relationship of the second threaded rod in this invention; Figure 6 This is a schematic diagram of the internal structure of the sealed housing in this invention.

[0016] In the diagram: 1. Simulated goaf chamber; 2. Lifting shell; 3. First motor; 4. First air chamber; 5. Air pipe; 6. Second air chamber; 7. Sealing plate; 8. Sealing shell; 9. Gas pipe; 10. Gas cylinder; 11. Ignition device; 12. Gas concentration sensor; 13. Temperature sensor; 14. Gas vent; 15. Cleaning scraper; 16. Control shell; 17. Limiting rod; 18. First gear; 19. Second gear; 20. First threaded rod; 21. Transmission rod; 22. Piston; 23. Second threaded rod; 24. Moving block; 25. Rotary wheel; 26. Connecting plate; 27. Lifting plate; 28. Second motor; 29. ​​Third threaded rod; 30. Lifting block; 31. Slide rail. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 like Figures 1-6 As shown, an experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf includes a goaf simulation chamber 1. A lifting shell 2 is provided at the bottom of the goaf simulation chamber 1. A first motor 3 is provided on the upper part of the lifting shell 2. A lifting component and a first threaded rod 20 are provided at the output end of the first motor 3. A transmission rod 21 is threadedly connected to the first threaded rod 20. The transmission rod 21 is slidably connected to a control shell 16. A piston 22 is fixedly connected to one side of the transmission rod 21. The control shell 16 is located on one side of the first motor 3. A first air chamber 4 is fixedly connected to the end of the control shell 16 away from the first motor 3. The piston 22 is fixedly connected inside the first air chamber 4. An air pipe 5 is fixedly connected to one side of the first air chamber 4. A second air chamber 6 is fixedly connected to the end of the air pipe 5 away from the first air chamber 4. The second air chamber 6 is fixedly connected to the goaf simulation chamber 1. A limit rod 17 is slidably connected inside the second air chamber 6. A cleaning scraper 15 is slidably connected inside the goaf simulation chamber 1.

[0019] The lifting assembly includes a first gear 18 at the output end of a first motor 3, a second gear 19 meshing with the first gear 18, the second gear 19 being rotatably connected to the lifting housing 2, a second threaded rod 23 being fixedly connected to the second gear 19, a moving block 24 being threadedly connected to the second threaded rod 23, connecting plates 26 being rotatably connected to both sides of the moving block 24, a lifting plate 27 being rotatably connected to the upper part of the connecting plate 26, a goaf simulation cavity 1 being rotatably connected to the upper part of the lifting plate 27, and rotating wheels 25 being rotatably connected to both sides of the moving block 24, the rotating wheels 25 being driven to the lifting housing 2, and a moving groove being opened inside the lifting housing 2, through which the rotating wheels 25 are driven to rotate.

[0020] In this embodiment, after the explosion test, starting the first motor 3 drives the first gear 18 and the first threaded rod 20 to rotate. The rotation of the first gear 18 drives the meshing second gear 19 to rotate, and the rotation of the second gear 19 drives the fixedly connected second threaded rod 23 to rotate. The rotation of the second threaded rod 23 drives the threadedly connected moving block 24 to move. The movement of the moving block 24 drives the rotating connecting plate 26 to rotate. During the movement of the moving block 24, the rotating wheels 25 on both sides are synchronously driven along the lifting shell 2, effectively ensuring the stability of the moving block 24 during movement. The rotation of the connecting plate 26 drives the upper rotatingly connected lifting plate 27 to move. The movement can lift the rear end of the goaf simulation chamber 1, causing it to tilt. During the tilting process, the rotation of the first threaded rod 20 can drive the threaded transmission rod 21 to move. The movement of the transmission rod 21 drives the fixedly connected piston 22 to move. When the piston 22 moves, a negative pressure is generated inside the first air chamber 4, which drives the limiting rod 17 set inside the second air chamber 6 to move inward. The movement of the limiting rod 17 can release the limitation on the cleaning scraper 15, so that the cleaning scraper 15 is affected by gravity after the goaf simulation chamber 1 tilts and scrapes along the inside of the goaf simulation chamber 1, thereby effectively cleaning the residue accumulated inside the goaf simulation chamber 1 after the explosion and reducing the safety hazards of high temperature and residual gas during manual operation.

[0021] Example 2 like Figures 1-6 As shown, a gas concentration sensor 12 is installed inside the goaf simulation chamber 1, and a temperature sensor 13 is installed on one side of the gas concentration sensor 12. An igniter 11 is fixedly connected inside the goaf simulation chamber 1. A heating component is installed on the side wall of the goaf simulation chamber 1, which can increase the internal temperature of the goaf simulation chamber 1. A gas vent 14 is opened inside the goaf simulation chamber 1. A gas pipe 9 is fixedly connected to one side of the gas vent 14. A gas cylinder 10 is fixedly connected to the end of the gas pipe 9 away from the gas vent 14. An air pump is installed at the connection between the gas cylinder 10 and the gas pipe 9, and the gas input is controlled by the air pump.

[0022] A sealing shell 8 is fixedly connected to the upper part of the goaf simulation chamber 1. A second motor 28 is installed on the upper part of the sealing shell 8. A third threaded rod 29 is installed at the output end of the second motor 28. A lifting block 30 is threadedly connected to the third threaded rod 29. A sealing plate 7 is fixedly connected to one side of the lifting block 30. The sealing plate 7 is slidably connected to the goaf simulation chamber 1. A slide rail 31 is fixedly connected inside the sealing shell 8. The lifting block 30 is slidably connected to the upper part of the slide rail 31.

[0023] In this embodiment, when the device is in use, gas is introduced into the goaf simulation chamber 1 through the gas vent 14. The gas concentration sensor 12 is used to adjust the concentration to the experimental set value. Then, residual coal is put into the goaf simulation chamber 1. After the residual coal is put in, the second motor 28 is started, which drives the third threaded rod 29 to rotate. The rotation of the third threaded rod 29 drives the threaded lifting block 30 to move downward. During the movement of the lifting block 30, the sliding rail 31 inside the sealing housing 8 can ensure its stability during movement. The movement of the lifting block 30 can drive the fixedly connected sealing plate 7 to move downward, thereby sealing the goaf simulation chamber 1. Then, the temperature inside the goaf simulation chamber 1 is raised by the heating component, and the igniter 11 is started to induce a gas explosion. Throughout the process, the temperature, gas concentration and explosion-related data are recorded by the sensors.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf, comprising a goaf simulation chamber (1), characterized in that, The bottom of the goaf simulation chamber (1) is provided with a lifting shell (2), and the upper part of the lifting shell (2) is provided with a first motor (3). The output end of the first motor (3) is provided with a lifting component and a first threaded rod (20). The first threaded rod (20) is threadedly connected to a transmission rod (21). The transmission rod (21) is slidably connected to the control shell (16). A piston (22) is fixedly connected to one side of the transmission rod (21). The control shell (16) is located on one side of the first motor (3). 6) A first air chamber (4) is fixedly connected to the end away from the first motor (3). A piston (22) is fixedly connected inside the first air chamber (4). An air pipe (5) is fixedly connected to one side of the first air chamber (4). A second air chamber (6) is fixedly connected to the end of the air pipe (5) away from the first air chamber (4). The second air chamber (6) is fixedly connected to the goaf simulation chamber (1). A limit rod (17) is slidably connected inside the second air chamber (6). A cleaning scraper (15) is slidably connected inside the goaf simulation chamber (1).

2. The experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf according to claim 1, characterized in that, The lifting assembly includes a first gear (18) provided at the output end of a first motor (3), a second gear (19) meshing with the first gear (18), and the second gear (19) being rotatably connected to the lifting housing (2).

3. The experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf according to claim 2, characterized in that, The second gear (19) is fixedly connected to the second threaded rod (23), the second threaded rod (23) is threadedly connected to the moving block (24), the moving block (24) is rotatably connected to the two sides of the connecting plate (26), the upper part of the connecting plate (26) is rotatably connected to the lifting plate (27), and the upper part of the lifting plate (27) is rotatably connected to the goaf simulation cavity (1).

4. The experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf according to claim 3, characterized in that, The movable block (24) is rotatably connected to two wheels (25), and the wheels (25) are connected to the lifting housing (2) via a transmission connection.

5. The experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf according to claim 1, characterized in that, A gas concentration sensor (12) is installed inside the goaf simulation chamber (1), and a temperature sensor (13) is installed on one side of the gas concentration sensor (12). An igniter (11) is fixedly connected inside the goaf simulation chamber (1).

6. The experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf according to claim 5, characterized in that, The goaf simulation chamber (1) is provided with a gas vent (14), a gas pipe (9) is fixedly connected to one side of the gas vent (14), and a gas cylinder (10) is fixedly connected to the end of the gas pipe (9) away from the gas vent (14).

7. The experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf according to claim 1, characterized in that, A sealing shell (8) is fixedly connected to the upper part of the goaf simulation cavity (1). A second motor (28) is provided on the upper part of the sealing shell (8). A third threaded rod (29) is provided at the output end of the second motor (28). A lifting block (30) is threadedly connected to the third threaded rod (29). A sealing plate (7) is fixedly connected to one side of the lifting block (30). The sealing plate (7) is slidably connected to the goaf simulation cavity (1).

8. The experimental device for inducing gas explosion through spontaneous combustion of residual coal in a coal mine goaf according to claim 7, characterized in that, The sealed housing (8) is fixedly connected to a slide rail (31), and a lifting block (30) is slidably connected to the upper part of the slide rail (31).

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